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  1. F

    454 year

    My 1980 GMC came with the 400 from the factory my brother installed the 454 out of one of his other trucks but I don't remember what year, how do I identify the year of this 454? Or how do I identify anything on this 454?
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    Dual tank switches and valves

    I am trying to get my fuel tank situated, I have dual tanks one was already replaced but I'm looking at this valve two-way valve, does anybody have a diagram of this valve and where the lines go? It's the valve that switches from one tank to the other
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    Two piece drive shaft bolts

    1980 GMC k 3500, Does anyone know what size bolts hold this two-piece driveshaft flange onto the output of the transfer case? It's the output that connects the drive shaft to the front differential
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    Two piece front drive shaft

    The drive shaft that came with my truck is about 3 in Long then it should be, it came with the automatic transmission from the factory, my brother put a standard transmission in and now the front two piece is too long, I've been looking for a replacement but I can't find one the exact length of...
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    Dual fuel tanks and valves

    My 1980 GMC 1 ton dually has dual fuel tanks on looking at the switch does anyone know which color wires or number goes to the left tank or the right tank? I'm trying to find information on how to troubleshoot the passenger side fuel tank has been replaced the driver's side has not been replaced...
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    Receiver hitches

    My 1980 GMC dually currently does not have a receiver hitch, there are several good used ones on Facebook market but I don't know what years will interchange with my truck, this may be a broad question but how do I find out what years 2 in receiver hitch will fit my 1980 GMC 1-ton dually?
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    Gear swap

    Someone wants to give me a set of 3.73 ring and pinion out of a 2002 GMC Sierra 2500 HD, would they possibly fit in my 1980 GMC 1 ton dually with a Dana 70 rear end? What other information would be needed?
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    Rear end

    I'm just curious as to what type of rear end my 1980 GMC 4x4 dually truck has, I haven't torn into it yet but soon I will to change the gears to a different ratio, it came from the factory with either 410 or 411, my brother changed the th400 automatic to a 3-speed standard, so the gearing isn't...
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    Air cleaner assembly

    Does anyone know if the factory air cleaner off of a 1987 square body will fit a 1980 GMC square body with a 454? Right now my truck has an Edelbrock carb and a pretty Chrome air cleaner but I want to put a quadrajet back on there and restore the air cleaner back to factory so it can draw cooler...
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    Hood

    Will the hood off of a 1981 Chevy GMC fit 1980 GMC k3500? How does the shape of headlights affect what Hood fits what truck?
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    17-in rims

    My 1980 GMC k 30 dual wheel truck came with 16-in rims from the factory, tires for this 16 in are getting harder to find so I thought of upgrading to the 17 in, the problem is GMC went to metrics and finding a set of dual wheels that will fit that can be a challenge but I found that Dodge did...
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    700r4

    In a previous post it was mentioned that I should get a 700 r4 transmission and put in my truck, what would be the most cost-effective way to acquire one of these and to either rebuild it or ensure that it's in good working order?
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    Good, body parts

    Hello, I have a 1980 GMC 1 Ton dually 4x4 needs new front body parts, hood, fenders ECT, what years will inner change?
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    Gears

    My 1980 GMC 1 ton truck came from the factory with four 10 gears 400 engine and a th400 tranny, my brother put a 454 in it with a three speed manual transmission and it seems like the differential gears are too high, my question is what size differential gears would have came with a manual...

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